A kind friend made the following panel up for me really fast. Thank you! :D
But she did not explain why the apple is sad.
Is it sad because it was bitten?
Is it sad because it was bitten and then not finished?
Was is mushy or grainy inside and thus not worth eating?
Perhaps all of this condensed into a realization that it's a failure as an apple, and now, rather than being consumed and enriching the life and body of a person, its fate will be to lie at the bottom of some trash bin and slowly rot away or be fed upon by insects?
We may never know. ._.